Garry Stanley, PG

Garry Stanley is a Principal Geologist Consultant based in Illinois with more than 20 years of environmental consulting experience focused on site investigation, groundwater assessment and remediation, and vapor intrusion…

Brandon Steets, PE

Brandon Steets, PE, is a Senior Principal Engineer based in California with more than 20 years of experience in National Pollutant Discharge Elimination System (NPDES) and Total Maximum Daily Load…

Olga Stewart, PE, PMP

Olga Stewart is a Principal Environmental Engineer based in Alaska with more than 13 years of experience focused on site characterization of contaminated sites; conceptual site model development and refinement;…

Tim Strowbridge, MSOE IPlantE

Tim Strowbridge, MSOE IPlantE, is a Principal Process and Environmental Consultant based in the United Kingdom with more than 30 years of experience as a process and project engineer. He…

Eric Suchomel, PhD, PE

Eric Suchomel is a Senior Principal Environmental Engineer based in California with more than 15 years of academic and professional experience focused on remedial program management, site investigation and characterization,…

James Stout, BCES

Jim Stout is a Senior Principal Environmental Scientist based in Texas with more than 31 years of experience focused on the effective management of environmental remediation projects for private and…

Terry M. Sullivan, PE

Terry Sullivan is a Senior Structural Engineer Consultant based in Kentucky with more than 40 years of experience focused on risk management and risk-informed design and construction for dams and…

Ken Susilo, PE, D.WRE

Ken Susilo is a Senior Principal Water Resources Engineer based in California with more than 25 years of experience focused on integrated urban stormwater management.

Will Tanner, PE

Will Tanner is a Principal Engineer based in Georgia with more than 16 years of experience focused on geotechnical and geostructural engineering and construction. His practice has evolved around a…

E. Onur Tastan, PhD, PE

Onur Tastan is a Principal Geotechnical Engineer based in North Carolina with more than 13 years of experience focused on geotechnical and geostructural engineering including field investigation, analysis, design, and…

Bailey Theriault, PG, LG

Bailey Theriault is a Senior Principal Geologist based in New Hampshire with more than 14 years of experience focused on geohazard assessment and management for oil and gas clients.

Jay Thompson, PhD, PE

Jay Thompson is a Senior Environmental Engineer based in Minnesota focused on site investigation and remediation, environmental forensics, environmental cost allocation, and contaminant fate and transport at complex sites.

Shanna Thompson, PE

Shanna Thompson is a Principal Environmental Engineer based in Georgia with more than 19 years of experience focused on site investigation, remediation design, and remediation system operation. She has performed…

Danielle Thorson, PEng

Danielle Thorson is a Senior Engineer based in Ontario with more than 15 years of experience focused on environmental consulting.

Eric Tollefsrud, PG

Eric Tollefsrud is a Principal Hydrogeologist based in Minnesota with more than 30 years of environmental consulting experience focused on the characterization and remediation of soil, soil vapor, and groundwater…

Gordon Thrupp, PhD, PG, CHG

Gordon Thrupp is a Principal Hydrogeologist based in California with more than 25 years of experience focused on evaluating geological and hydrogeological conditions. He has specialized in quantitative analysis of…

Denise Tripp

Denise Tripp is a Senior Consultant based in Massachusetts with more than 35 years of experience focused on environmental assessment and remediation and litigation support for clients in the paper,…

Jonathan Turk, LG, LHG

Jonathan Turk is a Principal Hydrogeologist based in Washington with more than 20 years of experience focusing on water resources, water supply, long-range planning, and climate response.

Jeffrey Tyburski, PG

Jeffrey Tyburski is a Senior Principal Geologist based in North Carolina with more than 36 years of experience focused on developing technically defensible and cost-effective solutions for environmental assessments, corrective…

Thomas Vainio-Mattila, PGeo, EurGeol

Thomas Vainio-Mattila is a Principal Environmental Consultant based in Ireland and with more than 25 years of experience focused on environmental consulting in Ireland, the UK and Germany.

Brian Valleskey, CFM

Brian Valleskey is a Senior Professional based in Wisconsin with more than 20 years of experience in water resources initiatives related to dam safety, compliance, permitting, analysis, and removal.

Jill Van Hulle, CWRE

Jill Van Hulle is a Senior Principal Water Resources Consultant based in Washington with 30 years of experience focusing on water rights and water supply development for numerous Washington cities,…

Lisa Van Tassell, PE

Lisa Van Tassell is a Senior Principal Environmental Engineer based in California with more than 15 years of experience focused on soil and groundwater remediation systems; site investigation and characterization,…

Elizabeth van Warmerdam, PGeo

Liz van Warmerdam is a Senior Principal Environmental Scientist based in British Columbia with more than 30 years of experience focused on assessing and delineating contamination in soil, groundwater, and…

David Vance, PG

David Vance is a Senior Principal Geologist based in Georgia with more than 18 years of experience restoring riverine and coastal systems.

Matt Vanderkooy, PGeo

Matt Vanderkooy is a Principal Contaminant Hydrogeologist based in Ontario with more than 12 years of experience focused on complex multidisciplinary challenges with a specialization in managing and directing per-…

Spencer D. Varnado

Spencer Varnado is a Senior Scientist based in Louisiana with more than 16 years of experience in environmental permitting and planning, ecological surveys, ecological restoration, and project management.

Srinivasa Varadhan, PhD, PE, PEng

Srini Varadhan is a Principal Environmental Engineer based in Ontario, Canada with more than 12 years of engineering, research, and consultation experience focused on large-scale and complex soil and groundwater…

Jesse Varsho, PE, PG

Jesse Varsho is a Senior Principal Engineer and Geologist based in Illinois with more than 19 years of experience in environmental consulting, landfill engineering, construction quality assurance, permitting, compliance, and…

Robert Veenstra

Robert Veenstra is a Principal Environmental Consultant based in Missouri with more than 30 years of experience focused on developing and managing complex soil, groundwater, surface water and sediment investigation…

Berend Velderman, PGeo

Berend Jan Velderman is a Senior Consultant based in Ontario with more than 30 years of experience in a variety of environmental projects including assessment and remediation of contaminated sites,…

Meena Viswanath, PE

Meena Viswanath is a Senior Engineer based in Maryland with more than 11 years of experience focused on waste containment design, geotechnical engineering and design, and geotechnical instrumentation and monitoring.

Fuad Wadud, PE

Fuad Wadud, PE, is a Principal Environmental Engineer based in Washington with more than 20 years of experience focused on air quality permitting and energy transition services.

Scott C. Walker

Scott Walker is a Senior Principal Ecologist based in Texas with more than 22 years of experience in project management, environmental impact assessment, ecological restoration, and environmental permitting and planning.

Annika Wallendahl, PE, LG, MBA

Annika Wallendahl is a Principal Engineer based in Washington with more than 20 years of experience focused on energy transition, environmental compliance, sustainability, and environmental engineering.

James Wang, PhD, PE

James (Yu-Sheng) Wang is a Principal Environmental Engineer based in Maryland with more than 25 years of experience focused on developing and applying innovative assessment and remediation technologies. James has…
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